Replaying Quests on live?

If your character has already passed the 3 ghost's quests pre-test realm, will we be able to go back and complete the new quests on live? I loved playing through them with my max level, and would like to re-do them as a time-killer in live. another question: What happened to the old locations that were part of the old ghost rat quests, such as the original fight with buster crab? it would feel like a shame for them to go to waste, could they be redirected into a side quest or something?